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|Image caption= The Emperor of Mankind battles Warmaster Horus Lupercal aboard the ''Vengeful Spirit''.
|Conflict = [[Horus Heresy]]
|Date = 0014119014-593014.[[M31]]{{Fn|30}} (~200 days{{Fn|}}{{Fn|Notes}})
|Location = [[Terra]]
|Outcome = Pyrrhic Loyalist victory
On the thirteenth day of Secundus, the bombardment of Terra began. From orbit, Horus' ships laid down an unrelenting barrage of missiles and energy beams. The first shell targeted the [[Sanctum Imperialis]], the Emperor's personal quarters, for symbolic reasons, though it did no damage and was quickly intercepted by many point defense systems. A vicious exchange of fire took place as the massive array of anti-ship gun batteries on Terra opened up on the traitor ships. Losses were incurred by both sides, but the traitor fleet in particular took heavy losses in space but endured through sheer weight of numbers.{{Fn|9a}} Horus' ultimate objective was the [[Imperial Palace]], seat of the Emperor himself. The orbital bombardment was some of the most intense ever witnessed and shook even the courageous and battle-hardened loyalists [[Space Marines]].{{Fn|1b}} However damage to the actual Palace itself was minimal due to a sophisticated multi-layered and self-repairing [[Void Shield]] system known as '''The Aegis''' as well as the fact that Terra's last orbital plate was placed over the Palace to serve as a shield and gun platform. However, due to a reactor flaw in one of the Aegis' reactors, a small weakness appeared in the Palace network centered around a Bastion outside the Helios Gate.{{Fn|9a}} Inside the depths of the Palace itself, the Emperor, attempting to keep the [[Golden Throne]] under control, could only brood over the desperate events occurring far above.{{Fn|1b}}
The bombardment continued for days as [[Perturabo]] probed for weaknesses in the Aegis, discovering the flaw around Bastion-16. The Aegis around this area was weakened enough to allow for slow-moving aircraft to penetrate. Despite the ragings of [[Angron]] and the boredom of [[Fulgrim]], Horus would not launch an all-out attack yet. The Emperor's might not only prevented [[Daemon]]s from manifesting on Terra, but also threatened to destroy the [[Daemon Primarch]]'s should they set foot upon its soil. [[Magnus]] and [[Zardu Layak]] surmised a ritual to eliminate the Emperor's barrier by spilling enough blood across Terra. Horus began to increasingly spend his time comatose, his spirit inside the Warp searching for lore as well as weakening the Emperor's spirit,{{Fn|9b}} eventually designating [[First Captain]] [[Ezekyle Abaddon]] as his proxy.{{Fn|9d}}After 12 days the bombardments continued, but were matched with the first ground assaults. Thousands of traitor vessels crashed into Terra's surface. Many were destroyed by the Palace defenses, but many more landed and unleashed endless hordes of Traitor [[Imperial Army]], [[Beastmen]], [[Cultist]]s, and [[Mutant]]s. These were largely distractionary measures to support the traitors' true objectives as they ravaged the planet, as well as support the traitor aerial attacks on the Palace's anti-ship guns and void shield generators. The loyalists responded with their own aerial defenses, and massive dogfights erupted over the Palace as the conscripts outermost trenches around the walls held against the attacks by the [[Lost and the Damned]]. While the Palace held, elsewhere across Terra major population centers fell such as Lundun, Noy Zaylant Hive, Neork, and Braslya.{{Fn|9l}}
[[Image:PalaceMapHH.jpg|thumb|right|250px|The Dark Mechanicum siege camps around the Imperial Palace]]
*It is left ambiguous as to who actually stands between Horus and the Emperor's broken body, with some stating it was a Custodian, Space Marine, or lone Guardsman [[Ollanius Pius]]. The Black Library novels reveal all three to have been true at different points.
*The Emperor is insistent that he be brought back to the throne after defeating Horus, whereas in the novels he is unconscious and they discover a tarot guide of the throne to guide them to the conclusion.
==={{Endn|Notes}}===
[[Sanguinius]]' stand at the [[Eternity Gate]] is stated to have been roughly 200 days into the battle.{{Fn|22h}} Mere hours are then depicted as having passed from the closing of the Eternity Gate until the time when the ''[[Vengeful Spirit]]'' drops its [[Void Shield]]s, prompting the [[Emperor]] to lead the final assault.{{Fn|24b}} Time essentially freezes by this point due to the [[Warp]]'s presence on Terra, with those involved in the battle experiencing wildly different timeframes for the remainder of the siege.{{Fn|26b}}
==See also==
**{{Endn|22f}}: Chapter 35-Epilogue
**{{Endn|22g}}: Chapters 26 & 29
**{{Endn|22h}}: Chapter 28
*{{Endn|23}}: [[Angron: The Red Angel (Novel)]], Chapter 4
*24: [[The End and the Death: Volume I (Novel)]]:
